The aircraft diverted to CFB Goose Bay, a military air base also used for civilian flights, and landed at 15:42 UTC after suffering an uncontained failure on its number 4 engine while flying southeast of Paamiut, Greenland. The engine had operated 3,527 cycles since new. There were no reported injuries or fatalities among the 497 passengers and 24 crew on board. Passengers were not allowed to disembark from the A380 until another Air France aircraft and a chartered aircraft arrived the next morning, because the airport is not equipped to accommodate a large number of passengers from commercial aircraft. The Air France aircraft landed at Atlanta, requiring a wait for its passengers to board another flight while the chartered Boeing 737 aircraft took passengers directly to Los Angeles with a refuelling stopover at Winnipeg. Pictures and video of the damaged engine were posted to social media by passengers; and of the landing by an observer on the ground.
Aircraft
The aircraft involved was an Airbus A380-861, registration F-HPJE, powered by four Engine Alliance GP7000 turbofan engines, delivered to Air France on 17 May 2011.
Investigation
Air France issued a press release stating that an investigation was underway to determine the cause of the engine failure, including representatives of the Bureau d'Enquêtes et d'Analyses pour la Sécurité de l'Aviation Civile, Airbus and Air France. The Transportation Safety Board of Canada is responsible for investigating aviation accidents in Canada and planned to send investigators. However, since the incident occurred over Greenland, the Danish Accident Investigation Board has jurisdiction over the investigation. On 3 October 2017 the Danish aviation authorities delegated the investigation to the BEA. Investigators from Denmark, the US and Canada joined the investigation. Advisors from Airbus, Air France and Engine Alliance also flew to Goose Bay. The first observation was that the engine's fan hub had detached during the flight and dragged the air inlet with it. Some six days later, debris from the aircraft's engine was recovered in Greenland. The BEA stated that "the recovery of the missing parts, especially of the fan hub fragments, was the key to supporting the investigation" and initiated a large search operation including synthetic-aperture radar overflights on a Dassault Falcon 20, but failed to locate the crucial components in 2018, before returning in 2019. In July 2019, another missing piece of the engine, weighing 150 kg, was located in Greenland and recovered.
Subsequent action
On 12 October 2017, the American Federal Aviation Administration issued an Emergency Airworthiness Directive affecting all Engine Alliance GP7270, GP7272 and GP7277 engines. The EAD required a visual inspection of the fan hub within a timescale of two to eight weeks, depending on the number of cycles an engine had operated since new. In June 2018 the FAA issued another Airworthiness Directive, requiring eddy-current testing of the fan hubs of GP7000 engines, to check for cracks in the slots in the hub that serve to attach the fan blades. In August 2019, the BEA announced that a part from the fan hub recovered from Greenland had been examined by the manufacturer Engine Alliance under BEA supervision. Metallurgical examination of the recovered titanium fan hub fragment identified a subsurface fatigue crack origin. The fracture was initiated in a microtextured area approximately in the middle of the slot bottom. Examination of the fracture was ongoing. Meanwhile, Engine Alliance announced to the affected A380 operators that an engine inspection campaign would be launched soon.
Recovery and repair
Air France announced plans to ferry the aircraft back to Europe for repair, with an inoperable replacement engine installed, for reasons of weight and balance. Such a flight requires special operating procedures, and thus rehearsal by the crew in a simulator. That plan was revised and the aircraft was subsequently ferried back from Goose Bay Airport to Charles de Gaulle Airport on 6 December 2017 using three operational engines and an Air France crew. The replacement engine was delivered, and the damaged engine flown to East Midlands Airport in the United Kingdom for examination by General Electric during the period 23–25 November 2017.The aircraft returned to service on 15 January 2018. Recovery of the fan hub from the Greenland ice sheet took place on 29–30 June 2019 after 20 months and four phases of complex aerial and ground search operations to locate the various elements from the engine.
